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This A515-43 is SSD and UEFI only. I prefer Ubuntu. However I've tried numerous distributions. All on USB created with rufus. They all fail to boot similarly. 'Problem loading UEFI:db X.509 certificate'. I've searched and searched for a work around. I've tried everything imaginable: I've disabled fastboot (bios and windows), tried booting with secure boot disabled (and enabled using a trusted boot efi file), I've shutdown windows from command line to get around 'unclean file system' error, I've downgraded bios and upgraded bios. But nothing gets me any closer to booting. The closest I've seem to come was with the Debian installer (ncurses I think).

But I did not want to go through with install before I could boot and run in live mode to make sure that the laptop will work once Linux successfully boots. Does anyone have any thoughts on how I can get Ubuntu to boot and install on this laptop? I really dislike using Windows and I seem to be stuck using it right now. The one thing that I haven't been able to pursue is modifying GRUB. I don't have a working Linux system to update GRUB.

Jay
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SOLVED (sort of). I was never able to completely boot live from USB. Although I now have Linux installed on the internal HDD (I still have windows on the SSD). Once I got the HDD installed, I had an extra drive. So I was able to experiment with the installation process without worrying about rendering my entire system unusable. I was able to install via NetInstall (mini.iso). I found that my usb drive was becoming unresponsive during the boot process. One time when it became unresponsive, I simply unplugged it and plugged it back in. The system recognized my usb drive once again and the installation process continued. It might have worked the same for a normal install. But I was already trying the NetInstall at that point.

Jay
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